Document Detail


Effects of hypoxia on oxygen affinity, hemoglobin pattern, and blood volume of early chicken embryos.
MedLine Citation:
PMID:  6189409     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We have investigated the influence of hypoxia (13.5% O2) on the oxygen affinity, hemoglobin pattern, and blood volume of chicken embryos. Data were collected between 4 and 9 days of incubation. It was found that the transition from embryonic to adult hemoglobin starts earlier in hypoxic embryos, due to a premature appearance of definitive red cells in the circulation. Blood oxygen capacity and total blood volume (related to embryonic weight) were not different from the controls. However, hypoxic embryos weighing more than 0.1-0.2 g have a significantly increased oxygen affinity (and decreased red cell adenosine 5'-triphosphate concentration). The higher O2 affinity partly compensates for the adverse effects of the lowered environmental PO2. In hypoxic embryos younger than 6 days, the Bohr effect is drastically increased, which allows a better oxygen extraction. Thus, the chicken embryo seems to be able to develop adaptive changes of blood O2 transport during hypoxia. The results support the view that the particular ontogenetic pattern of O2 affinity changes seen in avian or mammalian embryos arose from the need to adapt to the steadily changing conditions for O2 uptake.
Authors:
R Baumann; S Padeken; E A Haller; T Brilmayer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  244     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1983 May 
Date Detail:
Created Date:  1983-06-10     Completed Date:  1983-06-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R733-41     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Anoxia / metabolism*
Blood Volume*
Chick Embryo / metabolism*
Fetal Hemoglobin / metabolism
Hemoglobin A / metabolism
Hemoglobins / metabolism*
Hydrogen-Ion Concentration
Kinetics
Oxygen / blood*
Oxyhemoglobins / metabolism*
Chemical
Reg. No./Substance:
0/Hemoglobins; 0/Oxyhemoglobins; 7782-44-7/Oxygen; 9034-51-9/Hemoglobin A; 9034-63-3/Fetal Hemoglobin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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